High-Pressure Phase Transition of Micro- and Nanoscale HoVO(4) and High-Pressure Phase Diagram of REVO(4) with RE Ionic Radius

[Image: see text] In situ Raman spectra of HoVO(4) micro- and nanocrystals were obtained at high pressures up to 25.4 and 18.0 GPa at room temperature, respectively. The appearance of new peaks in the Raman spectra and the discontinuities of the Raman-mode shift provided powerful evidence for an irr...

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Autores principales: Gong, Junbo, Fan, Xiaodong, Dai, Rucheng, Wang, Zhongping, Ding, Zejun, Zhang, Zengming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2018
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6643725/
https://www.ncbi.nlm.nih.gov/pubmed/31458401
http://dx.doi.org/10.1021/acsomega.8b02519
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author Gong, Junbo
Fan, Xiaodong
Dai, Rucheng
Wang, Zhongping
Ding, Zejun
Zhang, Zengming
author_facet Gong, Junbo
Fan, Xiaodong
Dai, Rucheng
Wang, Zhongping
Ding, Zejun
Zhang, Zengming
author_sort Gong, Junbo
collection PubMed
description [Image: see text] In situ Raman spectra of HoVO(4) micro- and nanocrystals were obtained at high pressures up to 25.4 and 18.0 GPa at room temperature, respectively. The appearance of new peaks in the Raman spectra and the discontinuities of the Raman-mode shift provided powerful evidence for an irreversible zircon-to-scheelite structure transformation for HoVO(4) microcrystals at 7.2 GPa and for HoVO(4) nanocrystals at 8.7 GPa. The lattice contraction caused by the size effect was thought to be responsible for the different phase-transition pressures. Also, the higher stability of HoVO(4) nanocrystals compared with the microcrystals was also confirmed using the Raman frequencies and pressure coefficients. The results of the phase transition of HoVO(4) were compared with previously reported rare-earth orthovanadates, and the phase diagram of REVO(4) with RE ionic radius at different pressures was presented.
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spelling pubmed-66437252019-08-27 High-Pressure Phase Transition of Micro- and Nanoscale HoVO(4) and High-Pressure Phase Diagram of REVO(4) with RE Ionic Radius Gong, Junbo Fan, Xiaodong Dai, Rucheng Wang, Zhongping Ding, Zejun Zhang, Zengming ACS Omega [Image: see text] In situ Raman spectra of HoVO(4) micro- and nanocrystals were obtained at high pressures up to 25.4 and 18.0 GPa at room temperature, respectively. The appearance of new peaks in the Raman spectra and the discontinuities of the Raman-mode shift provided powerful evidence for an irreversible zircon-to-scheelite structure transformation for HoVO(4) microcrystals at 7.2 GPa and for HoVO(4) nanocrystals at 8.7 GPa. The lattice contraction caused by the size effect was thought to be responsible for the different phase-transition pressures. Also, the higher stability of HoVO(4) nanocrystals compared with the microcrystals was also confirmed using the Raman frequencies and pressure coefficients. The results of the phase transition of HoVO(4) were compared with previously reported rare-earth orthovanadates, and the phase diagram of REVO(4) with RE ionic radius at different pressures was presented. American Chemical Society 2018-12-26 /pmc/articles/PMC6643725/ /pubmed/31458401 http://dx.doi.org/10.1021/acsomega.8b02519 Text en Copyright © 2018 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Gong, Junbo
Fan, Xiaodong
Dai, Rucheng
Wang, Zhongping
Ding, Zejun
Zhang, Zengming
High-Pressure Phase Transition of Micro- and Nanoscale HoVO(4) and High-Pressure Phase Diagram of REVO(4) with RE Ionic Radius
title High-Pressure Phase Transition of Micro- and Nanoscale HoVO(4) and High-Pressure Phase Diagram of REVO(4) with RE Ionic Radius
title_full High-Pressure Phase Transition of Micro- and Nanoscale HoVO(4) and High-Pressure Phase Diagram of REVO(4) with RE Ionic Radius
title_fullStr High-Pressure Phase Transition of Micro- and Nanoscale HoVO(4) and High-Pressure Phase Diagram of REVO(4) with RE Ionic Radius
title_full_unstemmed High-Pressure Phase Transition of Micro- and Nanoscale HoVO(4) and High-Pressure Phase Diagram of REVO(4) with RE Ionic Radius
title_short High-Pressure Phase Transition of Micro- and Nanoscale HoVO(4) and High-Pressure Phase Diagram of REVO(4) with RE Ionic Radius
title_sort high-pressure phase transition of micro- and nanoscale hovo(4) and high-pressure phase diagram of revo(4) with re ionic radius
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6643725/
https://www.ncbi.nlm.nih.gov/pubmed/31458401
http://dx.doi.org/10.1021/acsomega.8b02519
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